Sylvania



P. THOMAS. ELECTRIC CONDENSER.

APPLICATION FILED SEPT. 28, I917.

Patented Dec. 14, 1920.

III! .I/ I I I I I I I I I I I I I I I I I I I I I M I I I I /I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I II I I I I I I I 9 I I I I I I I I I I I I I I I I I II I I I I I I I II I 8 I I I I I I I I I I I I I I I I I I l I II I I I I I I I l IIII l N V E N TO R P/if/flps 7/70/2705 BY WITNESSES yIW ATTORNEY UNITED STATES PATENT. OFFICE.

PHILLIPS THOMAS, OF EDGEWOOD PARK, PENNSYLVANIA, ASSIGNOR T0 WESTING- HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENN- SYLVANIA.

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Specification of Letters Patent. Patented Dec, 14:, 1920.

Application filed September 28, 1917. Serial No. 193,684.

T 0 all whom it may concern Be it known that I, PHILLIPS THOMAS, a citizen of the United States, and a resident of Edgewood Park, in the county of Allegheny and State of Pennsy1vania,have invented a new and useful Improvement in Electric Condensers, of which the following is a specification.

My invention relates to an improvement in the construction of electric condensers, and it has for an object to provide means for safeguarding the outer layers of condensers against breakdown caused by the interference of the impinging and reflected wave in the outer conducting plate.

Another object of my invention is to provide a construction which will prevent dirtthat may be in wax from getting through and short-circuiting the condenser.

A further object of my invention is to provide condenser terminals which are more rugged than those obtained heretofore in ordinary foil condensers.

A still further object of my invention is to provide means for smoothing over local potential differences which might be set up in the outer conducting layer as a result of electric wave reflection.

In the drawing, the single figure is a vertical section of my improved condenser.

Connection terminals 1 and 2, interiorly threaded, are respectively connected to terminal strips 3 and 4:. Terminal strip 45 is soldered, or otherwise suitably connected, to a series of conducting sheets 5 of tin foil or other similar conducting material. Interspersed, in alternation with conducting sheets 5, are similar conducting sheets 6 which are suitably electrically connected to terminal strip 3. Between each two adjacent conducting sheets 5 and 6 is placed a sheet 7 of dielectric material, preferably paper. The two upper conducting sheets 8 and 9 and the two lower conductlng sheets 10 and 11, which are termed hereinafter outer conducting sheets, are made of heavy foil, preferably of copper, with triple insulation between the copper sheets, as shown at 12, as well as between theouter tin-foil sheet and its adjacent copper sheet, as at 13. The entire structure, as shown, is preferably inclosed in a molded cover 14.

This provides a rugged construction, both electrically and mechanically. The added thickness of insulation at 12 safeguards the outer layer of the condenser against break quence of electric wave reflection.

The added thickness of the outer sheets of dielectric enables the sheets to serve as a filter for the outer layer of the condenser and thus to prevent any dirt that may be in the wax from getting through and short-circuiting the condenser. The copper foil of the outer conducting sheets by its greater tensile strength, produces a much more rugged terminal than that afforded by tin foil alone.

Obviously any suitable material ma be used for the cover 14: when it is provlded. While I have described the heavy outer conducting sheets 8, 9,10 and 11 as made of copper, they may also be made of aluminum or other material possessing good conductivity and considerable mechanical strength.

Although, in the drawing, two such heavy outer conducting sheets are shown connected to each terminal of the condenser, it is obvione that any desired number may be employed.

Various other modifications maybe made by persons skilled in the art without de arting from the spirit of the invention. t is, therefore, to be understood that my invention covers all such modifications, changes and adaptations as fall within the scope of the appended claims.

I claim as my invention:

1. A molded condenser comprising alternate sheets of insulating and conducting material, the inner sheets of said conducting material being of thin foil and the outer sheets of said conducting material being of heavy foil. Y

2. A condenser comprising alternate sheets of insulating and conducting material, the outer sheets of said conducting material having greater conductivity than the inner sheets of, conducting material.

3. Acondenser comprising alternate layers of insulating and conducting material, the inner layers of said insulating material being of thin dielectric material, and the outer layers of said insulating material being of heavy dielectric material.

4. A condenser comprising alternate layers of insulating and conducting material, the outer layers of said insulating material having greater dielectric strength than the inner layers of insulating material to prevent breakdown in consequence of electric wave interference in the outer conducting sheet.

5. A condenser comprising alternate layers of insulating and conducting material, the outer layers of insulating material having greater thickness than the inner layers jog insulating material, in order to serve as a ter.

6. A condenser comprising alternate layers of insulating and conducting material, the outer layers of insulating material and the outer layers of conductin material being respectively thicker than t e inner layers of insulating material and the inner layers of conducting material.

In testimony whereof I have hereunto subscribed my name this 18th day of Sept, 1917 PHILLIPS THOMAS. 

